dc.contributor.author |
Mosiori Cliff Orori, Maera John, Njoroge W. Kamande, Shikambe T. Reuben, Munji Matthew And Magare Robert |
|
dc.date.accessioned |
2019-11-11T15:36:49Z |
|
dc.date.available |
2019-11-11T15:36:49Z |
|
dc.date.issued |
2015 |
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dc.identifier.uri |
http://hdl.handle.net/123456789/9764 |
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dc.description.abstract |
A number of models have been developed to describe electron transfer between electrolytes and group II–VI binary semiconductors. In this report, a study was conducted to describe and model electron transfer between an inorganic semiconductor, (i.e. CdS) and a ferric oxidizing/reducing agent [i.e. K3Fe(CN)6/K4Fe(CN)6]. The study describes the interfacial electron transfer using the semi-classical theory approaches as described by Marcus and later developed by Gerischer and therefore called Gerischer model as it is applied to heterogeneous electron transfer in a semiconductor - electrolyte interface. CdS thin films were grown by electro-deposition method on the indium tin oxide (ITO) substrates and were used as electrodes. The data collected was used to determine the kinetic constant rates and re-orientation energies as measured in the solutions with different concentration of redox system, Fe+3/ Fe+2. Experiments showed that when concentration of oxidized species increased and causing an increase in 2 , F redoxE ° activity, the kinetic constant rates decreases inversely. Equally light induced current at 0.0V/Ag was higher when the ratio of the oxidant-reductant (i.e. 2/0.02 and 0.2/0.02) was high. EIS studies revealed that for the two ratios of. 2/0.02 and 0.2/0.02, the difference of current density was comparable to the transfer of the charge carriers for the oxidant-reductant electrolyte at 2/0.02 with respect to 0.2/0.02. |
en_US |
dc.title |
Modeling transfer of electrons between energy states of an electrolyte and CdS thin films using Gerischer Model |
en_US |